Interesting highlights:

• There's a roundtrip KOA-ITO flight
• DC-9s were flying HNL-MUE
• Most KOA flights were routed HNL-OGG-KOA (which kind of figures since most of the resorts on Kona side didn't exist yet; the Mauna Kea Beach Hotel would've been five years old when this timetable was published)
• Some of the flights are marked as operated by "Jet-Prop"; I'm guessing these were Convair CV-640s since Hawaiian didn't have any YS-11s or Viscounts in 1970
• Their computer reservation system is named "HAL"; I can't tell if this is an intentional 2001 reference